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TT: Fachverband Tiefe Temperaturen

TT 64: Coherent Quantum Dynamics (joint session DY, TT, organized by DY)

TT 64.11: Vortrag

Donnerstag, 23. März 2017, 12:30–12:45, ZEU 160

Adiabatic Dynamics of the Excited States for the Lipkin-Meshkov-Glick Model — •Wassilij Kopylov and Tobias Brandes — Technische Universität Berlin, Institut für Theoretische Physik, Berlin, Deutschland

We theoretically investigate the impact of the excited state quantum phase transition (ESQPT) on the adiabatic dynamics for the Lipkin-Meshkov-Glick model. Using a time dependent protocol, we continuously change a model parameter and discuss then the scaling properties of the system especially close to the ESQPT. On top, we show that the mean-field dynamic with the time dependent protocol gives the correct expectation values in the thermodynamic limit even for the excited states.

1) W. H. Zurek, U. Dorner, and P. Zoller, PRL 95, 105701 (2005) 2) H. J Lipkin, N. Meshkov and A. Glick, Nucl. Phys. 62, 188 (1965) 3)T. Caneva, R. Fazio and G. E. Santoro, PRB 78, 104426 (2008)